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33 <br />Results <br />LinnOlogical Data <br />Mean surface water temperatures during the period of study <br />increased from 1200 in Febnk-ay to 170C in April. Chlorophyll a <br />patterns in all treatments were similar (Fig. 1), peaking within the <br />first two weeks after initial filling of ponds, and declining <br />thereafter. Mean indices in high-treatment ponds were consistently <br />greater than in unfertilized ones, but statistically comparable to <br />those with medium fertilization. Variation was great, and <br />statistically significant differences occurred only in the first week. <br />Invertebrate nusbers and biomass began to increase 1 to 3 weeks <br />after ponds were filled (Fig. 2); ponds with high treatment were <br />earliest, and medium and low treatments later. High-treatment ponds <br />supported the greatest populations and biomass of invertebrates <br />thr Mt the study period, averaging 43.3 organ sms/L and 2,455 <br />"M3/z3- Medium- and low-treatment ponds supported averages of 23.7 <br />MVanisms/L and 354 mm3/m3 and 12.5/L and 257 =3/m3, respectively. <br />Statistically, numbers in high-treatment ponds were significantly <br />different from those in low treatments in weeks 2 and 3 combined, and <br />weeks 4 and 6. High and medium treatments differed only for combined <br />weeks 2 and 3. Volumes in high-treatment ponds differed significantly <br />from those in low treatments in weeks 4 through 6, and from medium <br />treatments in week 5.